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Old 08-05-2020, 09:23 PM #1
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Powdery mildew? Or hard water spots?

Hi all,

Feeling like I’m going crazy, so I wanted a sanity check. I’ve been dealing with some white spots on my plants. First instinct was that it is PM, but now I’m doubting it? I’ve been using doctor zymes eliminator as well as spot spraying H2O2. When I hit it with H2O2, it doesn’t seem to fizz like I’d expect it to, but it does seem to keep coming back. Plants are outside, I’m in the Bay Area, and while days have been a lil cloudy, I just can’t believe this would be a problem right now

Is this powdery mildew?
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Old 08-05-2020, 10:15 PM #2
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It doesn't look like water spots to me perhaps the H2O2 is causing it. If you have an RO filter I'd try to see if you can rinse the spots off. Distilled water would work too.
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Old 08-05-2020, 11:46 PM #3
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Looks like spider mite damage, but I can't be sure. Take a magnifier and look closely and rule out bugs, just to be on the safe side. .
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Old 08-06-2020, 12:13 AM #4
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II'd try to see if you can rinse the spots off. Distilled water would work too.
Try this. I did have a teeny bit of PM two weeks ago, which I attacked with water/detergent/baking soda mix. It solved the PM but a few days later I saw more - except it wasn't - it was only baking soda residue which did wash off.
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Old 08-07-2020, 02:24 AM #5
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Nice! Tragedy averted.
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Old 08-13-2020, 09:34 PM #6
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Hey all,

I thought I’d beat this, but still seeing some white spots that got me trippin. What do you guys think? Is this all PM?
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Old 08-13-2020, 09:45 PM #7
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Hydrogen peroxide on leaves will burn them. Water the soil or grow medium and not the plants.
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Old 08-13-2020, 10:38 PM #8
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Hydrogen peroxide on leaves will burn them. Water the soil or grow medium and not the plants.
3% right out of bottle will shrivel pistils, yes, maybe even burn leaves.
A solution of up to 1 % will not have any adverse effects in my experience.
H2O2 is useful to buy a couple of days to find a better solution or spot treat in between other treatments. Also useful to get you through the last week of flowering.
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Old 08-13-2020, 10:57 PM #9
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I’ve been using super diluted H2O2, and haven’t seen too much burning on my leaves. Do the most recent pictures look like PM?
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Old 08-13-2020, 11:00 PM #10
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